Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1681e082208875…

MALICIOUS

PDF

39.8 KB Created: 2020-04-10 14:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb4f091b442138b3741b258b0df62b03 SHA-1: 7429c6ec4032a9fc8f9ce1bc441827b15a1d2faa SHA-256: ef1681e0822088750b133050cd71ced1d8657bf822bca41da9eb2a2bf4384530
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links to domains with numeric or generic slugs suggests a link farm or redirection scheme designed to manipulate search engine results or lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hairbyheirgroom.com/uploads/1/3/1/4/131438510/131438510.html#curses+that+work+instantly
    • http://rileyslb.com/uploads/1/3/0/6/130621836/096b83b83.pdf
    • http://awkwardlibrarian.com/uploads/1/3/1/4/131453283/42282c8b372.pdf
    • http://holdenmusic808.com/uploads/1/3/1/4/131437605/8533d7cd149200.pdf
    • http://pmhomerenovation.org/uploads/1/3/1/4/131438067/5879010.pdf
    • http://z2gconsulting.com/uploads/1/3/0/7/130776541/toduji.pdf
    • http://brightbooksolutions.com/uploads/1/3/1/4/131406036/6364859.pdf
    • http://greatplainswoodcrafts.com/uploads/1/3/0/3/130313445/6792975.pdf
    • http://conceptarian.com/uploads/1/3/0/7/130739224/voxego.pdf
    • http://elgincoc.org/uploads/1/3/1/4/131483209/d5609c763.pdf
    • http://donpaulyowell.com/uploads/1/3/0/5/130588607/duledit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006832.bin
27eec16ca0f4d2a4228f5b934598cae3753e4c7113d1af427ae42bf4deae93a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6832 7536 bytes
font_01_sfnt_off00008589.bin
0c5104a3d8beb67dea61ed67a76757538cdb1450f4cb2c6a86e19ec240a02b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8589 2516 bytes

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